Efficient and energy-saving method for trapping carbon by ionic liquid

A technology of ionic liquids and anions, applied in separation methods, chemical instruments and methods, educts, etc., can solve problems such as large absorption enthalpy, easy volatilization of solvents, and easy corrosion of equipment, so as to reduce the enthalpy of action, increase the capture capacity, The effect of easy desorption

Inactive Publication Date: 2014-04-30
ZHEJIANG UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] At present, the main method of traditional industrial capture of carbon dioxide is the alcohol amine aqueous solution absorption method, which has the advantages of low raw material cost, fast absorption speed, and large absorption capacity, but there are also some limitations: such as the solvent is volatile and the equipment is easy to corrode , the absorbent is easy to oxidize, and the regeneration energy consumption is high. According to statistics, if a thermal power plant adopts this method to capture carbon dioxide, it needs to consume about 30% of the energy of the power plant
At present, in various methods of capturing carbon dioxide using functionalized ionic liquids, the common main problems are that the maximum absorption capacity is usually only equimolar, and the absorption enthalpy of the capture process is relatively large, the energy consumption is high, and the desorption is slow. easy

Method used

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  • Efficient and energy-saving method for trapping carbon by ionic liquid
  • Efficient and energy-saving method for trapping carbon by ionic liquid
  • Efficient and energy-saving method for trapping carbon by ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In a 5ml glass container with an internal diameter of 1cm, add ionic liquid tetradecyl trihexyl phosphoryl imidazole ([P 66614 ][Im-4-CHO]) 0.93g (0.016mol), then slowly introduce carbon dioxide gas, the flow rate is 60ml / min, the pressure is 0.1MPa, the absorption temperature is controlled at 30°C, and the absorption time is controlled at 1.5 hours. The weighing shows that the The absorption capacity of carbon dioxide in the ionic liquid is 1.43 mol / mol ionic liquid. The absorption enthalpy of the ionic liquid is -60kJ mol -1 .

Embodiment 2-7

[0021] Similar to Example 1, the carbon dioxide gas pressure was controlled at 0.1MPa, the absorption temperature was 30°C, and the type of ionic liquid was changed. The results of carbon dioxide absorption are shown in the following table (Table 1):

[0022] Table 1 Effect of different ionic liquid types on carbon dioxide capture

[0023]

[0024]

Embodiment 10-21

[0026] Similar to Example 1, tetradecyltrihexylphosphoryl imidazole was used as an absorbent to absorb carbon dioxide gas, and conditions such as absorption temperature, gas pressure, and absorption time were changed. The absorption results are shown in the following table (Table 2):

[0027] Table 2 Effect of different absorption conditions on carbon dioxide absorption

[0028]

[0029]

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PUM

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Abstract

The invention discloses an efficient and energy-saving method for trapping carbon by ionic liquid, which is applied to chemical trapping of carbon dioxide. A high-capacity, low-energy consumption and recyclable trapping of carbon dioxide is realized by using a synergistic effect of Lewis acids and bases and C-H...O, and thus a potential method is provided for industrial trapping of carbon dioxide. Compared with a conventional method, the method adopted by the invention is very novel, and has the following characteristics and beneficial effects: 1, through designing anion functionalized ionic liquid with different space structures and using the synergistic effect of Lewis acids and bases and C-H...O between carbonyl and carbon dioxide, the trapping amount of the ionic liquid to the carbon dioxide is greatly increased, which is up to 1.4mol / mole ionic liquid; and 2, due to the introduction of an electron-withdrawing function of the carbonyl, the acting enthalpy of the ionic liquid and the carbon dioxide is reduced, and the carbon dioxide is more easily desorbed.

Description

technical field [0001] The present invention mainly relates to a method for high-efficiency and energy-saving carbon capture of functionalized ionic liquids, mainly designing and synthesizing anionic functionalized ionic liquids of different structures, which are applied in the chemical capture of carbon dioxide, and utilizing the synergistic effect of Lewis acid-base and C-H...O, To achieve high-capacity, low-energy, and recyclable capture of carbon dioxide, and provide a potential method for industrial capture of carbon dioxide. Background technique [0002] The massive emissions of greenhouse carbon dioxide affect ecology, the environment and human health. The development of efficient, economical and energy-saving carbon capture technology has aroused extensive attention of researchers at home and abroad. As a new type of green solvent, ionic liquids have the advantages of low vapor pressure, wide liquid range, high stability, and designability, which provide opportuniti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14C01B31/20C01B32/50
CPCY02P20/151Y02P20/50
Inventor 王从敏丁芳罗小燕
Owner ZHEJIANG UNIV
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